CEL P0171 / P0134 after getting A/C Expansion Valve replaced. Well maintained and no other issues before AC repair. Please advise what to check. Prefer not to take back to mechanic.

Asked by JacJac21 Jul 06, 2015 at 09:49 PM about the 2001 Mitsubishi Montero Sport XLS

Question type: Maintenance & Repair

Current miles 157704.

2 Answers
4,235

Bender0013 answered 9 years ago

Code p0134 is bad oxygen sensor bank #1 code p0170 is bad oxygen sensor not heating up.

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JacJac21 answered 9 years ago

Thank you Bender. I did look up the code but I feel like it is too much of a coincidence for it to occur after taking it in and I do not want to bring it back to the same mechanic. Are there any test I can DIY to determine if the sensor is bad?

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